Thank you koneu!
This fixed the visual editor issue.
I had the same problem. Thought it was my theme but it turned out that wasn’t it. For Wp 3.3.1 you can find the toggle-box fix here:
http://wordpress.org/support/topic/plugin-toggle-box-bugfix-for-331
Also, in the twenty eleven theme h3 default that toggle box uses just didn’t look right. I modified the same togglebox.php file to use h4 (lowercase) and it works beautifully. Just need to document it for future updates. Hope this helps.
